861597925 has 6 divisors (see below), whose sum is σ = 1068381458. Its totient is φ = 689278320.

The previous prime is 861597907. The next prime is 861597929. The reversal of 861597925 is 529795168.

It can be written as a sum of positive squares in 3 ways, for example, as 61952641 + 799645284 = 7871^2 + 28278^2 .

It is not a de Polignac number, because 861597925 - 2¹⁹ = 861073637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861597929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17231934 + ... + 17231983.

Almost surely, 2^861597925 is an apocalyptic number.

It is an amenable number.

861597925 is a deficient number, since it is larger than the sum of its proper divisors (206783533).

861597925 is a wasteful number, since it uses less digits than its factorization.

861597925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34463927 (or 34463922 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 52.

The square root of 861597925 is about 29352.9883487184. The cubic root of 861597925 is about 951.5571599980.

The spelling of 861597925 in words is "eight hundred sixty-one million, five hundred ninety-seven thousand, nine hundred twenty-five".